REST(表示状态传输)是一种用于创建WebServices的体系结构。

and

RESTful是一种使用REST体系结构编写服务的方式。RESTful服务公开资源，以识别与客户机交互的目标。

REST stands for representational state transfer. That means that state itself is not transferred but a mere representation of it is. The most common example is a pure HTML server based app (no javascript). The browser knows nothing about the application itself but through links and resources, the server is able transfer the state of the application to the browser. Where a button would normally change a state variable (e.g. page open) in a regular windows application, in the browser you have a link that represents such a state change.

这个想法就是使用超媒体。也许还能创造出新的超媒体类型。我们可以用javascript/AJAX扩展浏览器，并创建新的自定义超媒体类型。这样我们就有了一个真正的REST应用程序。

This is my short version of what REST stands for, the problem is that it is hard to implement. I personally say RESTful, when I want to make reference to the REST principles but I know I am not really implementing the whole concept of REST. We don't really say SOAPful, because you either use SOAP or not. I think most people don't do REST the way it was envisioned by it's creator Roy Fielding, we actually implement RESTful or RESTlike architectures. You can see his dissertation, and you will find the REST acronym but not the word RESTful.

“REST”是一种体系结构范式。“RESTful”描述了使用该范例。

具象状态传输(REST)是软件体系结构的一种风格。正如Roy Fielding在一篇论文中描述的那样，REST是一种“架构风格”，基本上利用了现有的Web技术和协议。

RESTful通常用于指实现这种体系结构的web服务。

正如Jason在评论中所说，RESTful只是作为一个形容词，用来描述尊重REST约束的东西。

“REST服务”和“REST式服务”是一回事。

基于REST的系统是任何遵循原始文档中定义的REST约定的系统，该文档创建了基于REST的网络应用程序的思想。

值得注意的是，RESTfulness有不同的等级。总的来说，REST是一种风格，而不是标准，因此有根据需要进行解释的空间。一个例子是分层资源url(例如/things/ID/relatedthings) vs平面url(例如/things/ID和/relatedthings?thing=ID)